5.4-stable review patch. If anyone has any objections, please let me know.
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From: Vedang Nagar quic_vnagar@quicinc.com
commit 49befc830daa743e051a65468c05c2ff9e8580e6 upstream.
Add a check to ensure that the packet size does not exceed the number of available words after reading the packet header from shared memory. This ensures that the size provided by the firmware is safe to process and prevent potential out-of-bounds memory access.
Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files") Cc: stable@vger.kernel.org Signed-off-by: Vedang Nagar quic_vnagar@quicinc.com Co-developed-by: Dikshita Agarwal quic_dikshita@quicinc.com Signed-off-by: Dikshita Agarwal quic_dikshita@quicinc.com Reviewed-by: Bryan O'Donoghue bryan.odonoghue@linaro.org Signed-off-by: Bryan O'Donoghue bod@kernel.org Signed-off-by: Hans Verkuil hverkuil@xs4all.nl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/platform/qcom/venus/hfi_venus.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/media/platform/qcom/venus/hfi_venus.c +++ b/drivers/media/platform/qcom/venus/hfi_venus.c @@ -240,6 +240,7 @@ static int venus_write_queue(struct venu static int venus_read_queue(struct venus_hfi_device *hdev, struct iface_queue *queue, void *pkt, u32 *tx_req) { + struct hfi_pkt_hdr *pkt_hdr = NULL; struct hfi_queue_header *qhdr; u32 dwords, new_rd_idx; u32 rd_idx, wr_idx, type, qsize; @@ -305,6 +306,9 @@ static int venus_read_queue(struct venus memcpy(pkt, rd_ptr, len); memcpy(pkt + len, queue->qmem.kva, new_rd_idx << 2); } + pkt_hdr = (struct hfi_pkt_hdr *)(pkt); + if ((pkt_hdr->size >> 2) != dwords) + return -EINVAL; } else { /* bad packet received, dropping */ new_rd_idx = qhdr->write_idx;